On line 300 of a thousand line file, Vim will show you that you're 30% through the file. But what if most of the lines have one character in them, and some of them have twenty thousand? Sometimes it comes in handy to know your percentage through the file in terms of current-byte / total-bytes. I looked through the Vim docs and couldn't find a way to do this, so I wrote a Vim function to show it.